A Revised Experimental Upper Limit on the Electric Dipole Moment of the Neutron

Abstract

We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in the understanding of the effects of gravity in depolarizing ultracold neutrons (UCN); an improved calculation of the spectrum of the neutrons; and conservative estimates of other possible systematic errors, which are also shown to be consistent with more recent measurements undertaken with the apparatus. We obtain a net result of $d_{\mathrm{n}}=-0.21\pm 1.82\times 10^{-26}$ $e$cm, which may be interpreted as a slightly revised upper limit on the magnitude of the EDM of $3.0\times 10^{-26}$ $e$cm (90% CL) or $3.6\times 10^{-26}$ $e$cm (95% CL). This paper is dedicated by the remaining authors to the memory of Prof. J. Michael Pendlebury.

23 pages, 19 figures. Authorship list changed to put J.M. Pendlebury first. Other very minor edits

References in corpus (5)

• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Improved limit on the permanent electric dipole moment of 199Hg
• A measurement of the neutron to 199Hg magnetic moment ratio
• Reply to Comment on ``An Improved Experimental Limit on the Electric Dipole Moment of the Neutron''
• Comment on "An Improved Experimental Limit on the Electric-Dipole Moment of the Neutron," C.A.Baker et al [hep-ex/0602020]

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